Low-mass X-ray binaries and radiopulsars in binary systems

Astronomy and Astrophysics – Astronomy

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X-Ray Binaries, Pulsars, X-Ray

Scientific paper

We review the study of high-energy emission from accreting neutron stars and radio pulsars in binary systems with particular emphasis on results from the Compton Observatory. BATSE detected emission in the energy range 20-200 keV from several low-mass X-ray binaries believed to contain weakly magnetized neutron stars. Twelve low-mass X-ray binaries (also including sources detected by SIGMA) have been significantly detected in the hard X-ray band. Before the SIGMA and BATSE discoveries only black hole candidates were known to emit hard X-ray emission. We review the existing observations in the hard X-ray energy band, address the issue of neutron star vs. black hole high-energy emission, and discuss theoretical implications. Binaries containing energetic radiopulsars are also a potential source of high-energy emission. We discuss the important CGRO detection of the Be star/pulsar system PSR B1259-63 near periastron and its implications.

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